Operating Legacy S7-400H CPU 414-4H (6ES7414-4HM14-0AB0) in SIMATIC PCS 7 V9.0: Firmware V4.5 Prerequisites

In SIMATIC PCS 7 V9.0, the legacy fault-tolerant controller CPU 414-4H (6ES7414-4HM14-0AB0) is officially supported and listed in the 'Released Modules' catalog, provided it runs Firmware V4.5. Earlier firmware revisions (such as V4.0) are not released and will fail system consistency checks during compilation. While fully functional for existing plant operations, this CPU is a legacy module in phase-out status: it lacks native PROFINET interfaces, does not support PROFINET system redundancy (S2), and cannot leverage CPU 410-5H System Expansion Card scaling. Validate lifecycle planning and replacement options with an authorized Siemens distributor or the Siemens Industry Mall.

Executive Summary

Process facilities planning software upgrades to SIMATIC PCS 7 V9.0 often question whether existing S7-400H controller hardware can be retained to avoid costly hardware rip-and-replace outages. For systems powered by CPU 414-4H (catalog number 6ES7414-4HM14-0AB0), Siemens officially released this module for PCS 7 V9.0 under the strict prerequisite that the CPUs operate on Firmware V4.5. However, because modern PCS 7 V9.0 heavily emphasizes PROFINET architectures, operating legacy V4.5 hardware introduces distinct technological boundaries. This technical guide outlines firmware verification procedures, release constraints, and modernization pathways.

Architecture and Fundamental Mechanics

The compatibility matrix of the CPU 414-4H under PCS 7 V9.0 involves specific hardware and firmware dependencies:
1. Official Release Status:
According to the Siemens PCS 7 Released Modules (V9.0) catalog, the 6ES7414-4HM14-0AB0 is officially approved for fault-tolerant and fail-safe automation when executing Firmware Version 4.5.0 or higher. The STEP 7 V5.6 hardware catalog includes this module under the standard S7-400H profile.
2. Architectural Limitations of V4.5 Hardware:
- Memory Boundaries: Integrated work memory is limited to 2.8 MB (1.4 MB code, 1.4 MB data), restricting total Process Objects (typically up to 400–600 POs depending on APL block mix).
- Communication Architecture: The CPU features integrated MPI/DP and DP master ports, but lacks onboard Industrial Ethernet. It relies on external CP 443-1 communication processors for Plant Bus connectivity.
- No Native PROFINET S2: Unlike CPU 410-5H, the CPU 414-4H cannot directly terminate redundant PROFINET S2 rings; distributed I/O must remain on PROFIBUS DP.
- Legacy Product Status: The module is in Siemens product phase-out (P.M400 milestone), meaning spare parts are subject to surcharges and eventual obsolescence.

Step-by-Step Implementation Procedure

Verify Physical CPU Hardware Catalog Number:
a. Inspect the physical CPU front faceplate or barcode label on both redundant sub-racks.
b. Confirm the article number: 6ES7414-4HM14-0AB0.
Check Online Firmware Version in SIMATIC Manager:
a. Connect the Engineering Station to the CPU via MPI, PROFIBUS, or Industrial Ethernet (via CP 443-1).
b. In SIMATIC Manager, select PLC -> Module Information.
c. Inspect the 'General' tab: verify the firmware revision.
d. If the firmware is V4.5.0 or higher, the CPU meets PCS 7 V9.0 requirements.
e. If the firmware is below V4.5 (e.g., V4.0), a firmware update is mandatory before upgrading PCS 7.
Execute Firmware Update to V4.5 (If Required):
a. Download the official Firmware V4.5.x update files from SIOS.
b. Place the redundant station in a controlled maintenance state.
c. In SIMATIC Manager, select PLC -> Update Firmware and transfer the update to both CPU 0 and CPU 1.
d. Reset the CPU (MRES) to load the new operating system.
Configure in STEP 7 HW Config (PCS 7 V9.0):
a. In the PCS 7 V9.0 project, open HW Config.
b. In the hardware catalog, navigate to SIMATIC 400 -> CPU 400 -> CPU 414-4H -> 6ES7 414-4HM14-0AB0 -> V4.5.
c. Insert the CPU into Rack 0 and Rack 1.
d. Configure the sync submodules and CP 443-1 communication processors.
e. Save and compile HW Config: confirm 0 compilation errors.

Verification

In HW Config online test mode, connect to both CPUs: verify that both report Firmware V4.5 with green operational status.
In SIMATIC Manager, execute a test chart compilation and download to the controller.
Verify redundancy synchronization: confirm that both CPUs transition into RUN-Redundant mode (RUN and ACT/STBY LEDs solid green without REDF fault).

Limitations and Operational Precautions

Operating legacy CPU 414-4H under PCS 7 V9.0 restricts the plant from using modern PROFINET distributed I/O families (such as ET 200SP HA) and limits future migration options; planning a phased migration to CPU 410-5H is strongly advised.

Engineer FAQ

Is CPU 6ES7414-4HM14-0AB0 compatible with PCS 7 V9.0?

Yes. It is officially released for PCS 7 V9.0 provided it is running Firmware V4.5.

What happens if my CPU has Firmware V4.0?

STEP 7 HW Config in PCS 7 V9.0 will flag the module as incompatible or inconsistent during compilation. You must update firmware to V4.5.

Can CPU 414-4H support PROFINET S2 redundant I/O?

No. The CPU 414-4H lacks native PROFINET interfaces and cannot terminate PROFINET S2 redundancy. Distributed I/O must remain on PROFIBUS DP.

What is the modern replacement for CPU 414-4H in PCS 7?

The SIMATIC CPU 410-5H Process Automation controller, which provides native redundant PROFINET, expandable PO licensing, and massive work memory.

Where can I download the V4.5 firmware update for CPU 414-4H?

From the Siemens Industry Online Support (SIOS) portal under the S7-400H firmware download section.

Technical References

Related Tags

CPU 414-4H
PCS 7 V9.0
Firmware V4.5
S7-400H
Hardware Compatibility
Released Modules

Hardware Compatibility

Released Modules

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Operating Legacy S7-400H CPU 414-4H (6ES7414-4HM14-0AB0) in SIMATIC PCS 7 V9.0: Firmware V4.5 Prerequisites